Rocket works on the principle of conservation of momentum

The principle of conservation of momentum states that the total momentum of a closed system remains constant if no external forces act on it. In simpler terms, this means that the total momentum before an event is equal to the total momentum after the event.

A rocket operates on this principle by expelling mass at high velocities in one direction, which leads to a corresponding change in velocity in the opposite direction. This is known as the principle of action and reaction, or Newton's third law of motion.

Explanation:
To understand how a rocket works based on the conservation of momentum, let's break it down into a few key points:

1. Newton's Third Law of Motion:
According to Newton's third law of motion, for every action, there is an equal and opposite reaction. In the case of a rocket, the action is the expulsion of exhaust gases at high speeds, and the reaction is the resulting forward motion of the rocket itself.

2. Exhaust Gases:
A rocket carries a fuel source, such as liquid or solid propellants, which are burned to produce hot gases. These gases are expelled out of the rocket's engine nozzle at high speeds.

3. Expulsion of Mass:
As the hot gases are expelled out of the rocket, they carry with them a certain amount of mass. According to the conservation of mass, the total mass of the rocket and the expelled gases remains constant.

4. Change in Velocity:
As the gases are expelled at high speeds in one direction, the rocket experiences a change in velocity in the opposite direction. This change in velocity is governed by the conservation of momentum, which states that the total momentum of the system (rocket + expelled gases) remains constant.

5. Thrust:
The change in velocity of the rocket results in a force known as thrust. This thrust propels the rocket forward, overcoming the force of gravity and allowing it to reach outer space.

In summary, a rocket works on the principle of conservation of momentum. By expelling mass at high velocities in one direction, the rocket experiences a change in velocity in the opposite direction, leading to forward motion. This is achieved through the action and reaction forces described by Newton's third law of motion.